Microscopic structural changes during photodegradation of low-density polyethylene detected by Raman spectroscopy
Raman spectroscopy has been used to reveal the microscopic structural changes of low-density polyethylene under ultraviolet irradiation. The fraction of non-crystalline consecutive trans chains (the molecular chains in the trans conformation separate from the orthorhombic crystalline phase) drastica...
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| Veröffentlicht in: | Polymer degradation and stability 2018-04, Vol.150, p.67-72 |
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| creator | Hiejima, Yusuke Kida, Takumitsu Takeda, Kento Igarashi, Toshio Nitta, Koh-hei |
| description | Raman spectroscopy has been used to reveal the microscopic structural changes of low-density polyethylene under ultraviolet irradiation. The fraction of non-crystalline consecutive trans chains (the molecular chains in the trans conformation separate from the orthorhombic crystalline phase) drastically decreases at ∼600 h, together with a decrement in the molecular weight and an increment in the crystallinity owing to chemicrystallization. This suggests that short trans chains are prolonged to form consecutive trans chains before chemicrystallization. Moreover, gradual increases of the stretching and compression stresses are observed on the trans and amorphous chains, respectively. These conformational changes are detected by Raman spectroscopy even in the early stage of photodegradation. Chemicrystallization at ∼600 h is accompanied by structural changes, such as shortening of the interchain distance of the lamellar crystals and thinning of the amorphous layer, which induce formation of surface cracks on the macroscopic specimen.
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| doi_str_mv | 10.1016/j.polymdegradstab.2018.02.010 |
| format | Article |
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[Display omitted]</description><subject>Change detection</subject><subject>Chemicrystallization</subject><subject>Crystal structure</subject><subject>Crystallinity</subject><subject>Crystallization</subject><subject>Density</subject><subject>Low density polyethylenes</subject><subject>Low-density polyethylene</subject><subject>Molecular chains</subject><subject>Molecular conformation</subject><subject>Organic chemistry</subject><subject>Photodegradation</subject><subject>Polyethylene</subject><subject>Raman spectroscopy</subject><subject>Spectrum analysis</subject><subject>Surface cracks</subject><subject>Ultraviolet radiation</subject><issn>0141-3910</issn><issn>1873-2321</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqNkMFL7DAQxoM8wX3q_xAQj62ZdNvEgwcRnwqKIHoOaTLZzdJtapK-R_97u_SdPDmXgeGb75v5EXIJrAQGzdWuHEI37S1uorYp67bkDGTJeMmAHZEVSFEVvOLwi6wYrKGoroGdkN8p7dhc6xpW5PPFmxiSCYM3NOU4mjxG3VGz1f0GE7Vj9P2GDtuQwxKksw89DY524V9hsU8-T_RwCObt1GGP1GJGk9HSdqJveq97moZ5sMRMZ-TY6S7h-f9-Sj7-3L_fPRbPrw9Pd7fPhVkLyAXUFTaudi022FybCp0Bhq2TKKXgUGtAXkspubO1NMK0XAvtDEewGlonqlNysfgOMXyOmLLahTH2c6TirKnEuhFCzqqbRXWgkCI6NUS_13FSwNSBstqpb5TVgbJiXM2U5_2HZR_nV_56jCoZj71B6-P8s7LB_9DpC0FZlCs</recordid><startdate>201804</startdate><enddate>201804</enddate><creator>Hiejima, Yusuke</creator><creator>Kida, Takumitsu</creator><creator>Takeda, Kento</creator><creator>Igarashi, Toshio</creator><creator>Nitta, Koh-hei</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope><orcidid>https://orcid.org/0000-0001-9197-2021</orcidid></search><sort><creationdate>201804</creationdate><title>Microscopic structural changes during photodegradation of low-density polyethylene detected by Raman spectroscopy</title><author>Hiejima, Yusuke ; Kida, Takumitsu ; Takeda, Kento ; Igarashi, Toshio ; Nitta, Koh-hei</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c471t-153e6f5fbe6e69c3efc10ebf8e887215a1e258882fd58c7cb2a7afc2e1da1bf73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Change detection</topic><topic>Chemicrystallization</topic><topic>Crystal structure</topic><topic>Crystallinity</topic><topic>Crystallization</topic><topic>Density</topic><topic>Low density polyethylenes</topic><topic>Low-density polyethylene</topic><topic>Molecular chains</topic><topic>Molecular conformation</topic><topic>Organic chemistry</topic><topic>Photodegradation</topic><topic>Polyethylene</topic><topic>Raman spectroscopy</topic><topic>Spectrum analysis</topic><topic>Surface cracks</topic><topic>Ultraviolet radiation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hiejima, Yusuke</creatorcontrib><creatorcontrib>Kida, Takumitsu</creatorcontrib><creatorcontrib>Takeda, Kento</creatorcontrib><creatorcontrib>Igarashi, Toshio</creatorcontrib><creatorcontrib>Nitta, Koh-hei</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Polymer degradation and stability</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hiejima, Yusuke</au><au>Kida, Takumitsu</au><au>Takeda, Kento</au><au>Igarashi, Toshio</au><au>Nitta, Koh-hei</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Microscopic structural changes during photodegradation of low-density polyethylene detected by Raman spectroscopy</atitle><jtitle>Polymer degradation and stability</jtitle><date>2018-04</date><risdate>2018</risdate><volume>150</volume><spage>67</spage><epage>72</epage><pages>67-72</pages><issn>0141-3910</issn><eissn>1873-2321</eissn><abstract>Raman spectroscopy has been used to reveal the microscopic structural changes of low-density polyethylene under ultraviolet irradiation. The fraction of non-crystalline consecutive trans chains (the molecular chains in the trans conformation separate from the orthorhombic crystalline phase) drastically decreases at ∼600 h, together with a decrement in the molecular weight and an increment in the crystallinity owing to chemicrystallization. This suggests that short trans chains are prolonged to form consecutive trans chains before chemicrystallization. Moreover, gradual increases of the stretching and compression stresses are observed on the trans and amorphous chains, respectively. These conformational changes are detected by Raman spectroscopy even in the early stage of photodegradation. Chemicrystallization at ∼600 h is accompanied by structural changes, such as shortening of the interchain distance of the lamellar crystals and thinning of the amorphous layer, which induce formation of surface cracks on the macroscopic specimen.
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| subjects | Change detection Chemicrystallization Crystal structure Crystallinity Crystallization Density Low density polyethylenes Low-density polyethylene Molecular chains Molecular conformation Organic chemistry Photodegradation Polyethylene Raman spectroscopy Spectrum analysis Surface cracks Ultraviolet radiation |
| title | Microscopic structural changes during photodegradation of low-density polyethylene detected by Raman spectroscopy |
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